ordeal
n
difficult or painful experience (esp one that tests a person's character or powers of endurance) 苦难经历; (尤指对品格、 耐力的)严峻考验
the ordeal of divorce 离婚的痛苦
The hostages went through a dreadful ordeal. 个个人质都经历了可怕的折磨.
It soon became clear that the straight part of the dance changed when the sun's position changed. If the feeding place was toward the sun, the dancer headed straight upward during the straight part of the wagging dance.